android中屏蔽其它系统按钮的dialog

public class MyProgressDialog extends ProgressDialog {public MyProgressDialog(Context context) {super(context);this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);// TYPE_KEYGUARD_DIALOG:disable any key,eg:back key,home key etc.}@Overridepublic boolean onSearchRequested() {return false;}}